Answer:
Red algae - acquired plastids by secondary endosymbiosis
Explanation:
Red algae are believed to have undergo a primary endosymbiosis event. Then a second endosymbiosis event created a large group known as heterokonts. During the primary endosymbiosis event red algae acquire their plastids.
All of the following are condition that organisms in a tidepool must withstand except for the constant salinity.
They don't reproduce, as far as I know. They are produced in bone marrow.
Hello! Flagella and cilia assist the cell in moving around. It's somewhat comparable to an arm or leg propelling someone forward when swimming- cells may not have limbs but they have flagellas and cilias
